US20180342759A1 - Lithium-ion battery cell and lithium-ion battery - Google Patents

Lithium-ion battery cell and lithium-ion battery Download PDF

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Publication number
US20180342759A1
US20180342759A1 US15/779,384 US201615779384A US2018342759A1 US 20180342759 A1 US20180342759 A1 US 20180342759A1 US 201615779384 A US201615779384 A US 201615779384A US 2018342759 A1 US2018342759 A1 US 2018342759A1
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Prior art keywords
negative
positive
lugs
lug
plate
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Abandoned
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US15/779,384
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Inventor
Kuan Zhong
Shiyong JIANG
Wenhua Wang
Ying Li
Qianqian Li
Hongming Liu
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Assigned to GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI reassignment GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JIANG, Shiyong, LI, QIANQIAN, LI, YING, LIU, HONGMING, WANG, WENHUA, ZHONG, Kuan
Publication of US20180342759A1 publication Critical patent/US20180342759A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H01M2/30—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane

Definitions

  • the present disclosure relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery cell and a lithium-ion battery.
  • Power lithium-ion batteries mainly include types of cylindrical, laminated aluminum plastic film, winding square (aluminum cased), laminated square and the like.
  • a process for a cylindrical battery is mature, the cylindrical battery has a high consistency and may be designed to have a high rate.
  • capacity of the cylindrical battery is small.
  • a laminated battery has an advantage of a high rate performance.
  • a winding square battery may be designed to have a high capacity, while the rate performance is reduced.
  • a battery with an aluminum plastic film case is prone to be deformed and destroyed by an external force.
  • An energy storage battery do not have a high requirement on the rate performance, in this case, aluminum cased batteries have advantages in this respect.
  • a good rate performance is also required. Therefore, it is of great significance for application fields requiring high-capacity single batteries such as the electric vehicles field and the energy storage field to design a battery packaged in an aluminum case, which has a larger capacity and an improved rate performance.
  • the laminated battery is an effective selection for a high rate battery.
  • the laminated battery has a superior rate performance and a large number of lugs due to the characteristics of lamination.
  • the preparation efficiency is low, a displacement is prone to occur between adjacent layers, and there is a large safety margin due to many burrs on an edge of a plate.
  • the amount of self-discharge of the battery is large.
  • the number of lugs may be increased by increasing the number of cells connected in parallel, which may reduce capacity and the preparation efficiency of the battery, and may also affect the consistency of the battery. Therefore, a new lithium-ion battery is required.
  • the lithium-ion battery cell may have multiple positive lugs and multiple negative lugs, and the multiple positive lugs and the multiple negative lugs are wound to form the lithium-ion battery cell.
  • a lithium-ion battery cell which includes a positive plate, a membrane, and a negative plate. Multiple positive lugs are arranged sequentially on the positive plate in a unfolded state. Multiple negative lugs are arranged sequentially on the negative plate in a unfolded state. The positive plate and the negative plate are separated by the membrane and are wound to form the lithium-ion battery cell.
  • the multiple positive lugs form a lug laminated structure or a lug staggered structure.
  • the multiple negative lugs form a lug laminated structure or a lug staggered structure.
  • multiple positive lugs are arranged in parallel in a direction along a length of the positive plate.
  • a first lug margin x 1 indicates a distance between a first positive lug and a head of the positive plate.
  • the lithium-ion battery cell is square, and the multiple positive lugs form the lug laminated structure.
  • t indicates a sum of thicknesses of the positive plate, the membrane and the negative plate.
  • w indicates a width of the cell.
  • the first positive lug is the one of the positive lugs which is located closest to the head of the positive plate.
  • n 1 indicates that a positive lug is located at the n 1 -th w on the positive plate along a direction from the head to a tail of the positive plate.
  • n 3 indicates that a positive lug is located at the (n 3 +1)-th w on the positive plate along the direction from the head to the tail of the positive plate.
  • the multiple negative lugs are arranged in parallel in a direction along a length of the negative plate.
  • a second lug margin x 2 indicates a distance between a first negative lug and a head of the negative plate.
  • the multiple negative lugs form the lug laminated structure.
  • the first negative lug is the one of the negative lugs which is located closest to the head of the negative plate.
  • n 2 indicates that a negative lug is located at the n 2 -th w on the negative plate along a direction from the head to a tail of the negative plate.
  • n 4 indicates that a negative lug is located at the (n 4 +1)-th w on the negative plate along the direction from the head to the tail of the negative plate.
  • the multiple positive lugs form the lug staggered structure, where d 1 of each of m 1 positive lugs in the multiple positive lugs is increased or decreased by a first interval value corresponding to the positive lug; and/or the multiple negative lugs form the lug staggered structure, where d 2 of each of m 2 negative lugs in the multiple negative lugs is increased or decreased by a second interval value corresponding to the negative lug.
  • intervals between adjacent staggered positive lugs in the m 1 positive lugs are the same.
  • intervals between adjacent staggered negative lugs in the m 2 negative lugs are the same.
  • the first lug margin x 1 is less than or equal to 0.5w
  • the second lug margin x 2 is less than or equal to 0.5w.
  • the width w of the cell is greater than or equal to 5 cm and is less than or equal to 20 cm.
  • a distance between the tail of the positive plate and a positive lug closest to the tail of the positive plate is less than 8w
  • a distance between the tail of the negative plate and a negative lug closest to the tail of the negative plate is less than 8w.
  • the positive lug is made of aluminum or aluminum-nickel alloy
  • the negative lug is made of nickel, copper or copper-nickel alloy.
  • the multiple positive lugs are welded together by using ultrasonic; and the multiple negative lugs are welded together by using ultrasonic.
  • the positive plate is coated with positive electrode slurry which is made by mixing a positive electrode powder, a conductive agent, an adhesive and an additive
  • the negative plate is coated with negative electrode slurry which is made by mixing a negative electrode powder, a conductive agent, an adhesive and an additive
  • a lithium-ion battery which includes a battery case and the above-described lithium-ion battery cell in the battery case.
  • the battery case is made of aluminum.
  • the rate performance of the battery is improved, and the consistency of the battery cell is improved, thereby facilitating grouping and modularized expansion, thus ensuring a stable operation and prolonging the service life.
  • the safety performance and the production efficiency are improved, occurrence of burrs at the edge of the plate and the self-discharging rate are reduced, thereby improving stability of the battery.
  • FIG. 1A and FIG. 1B are schematic diagrams respectively showing a positive plate in a unfolded state and a negative plate in a unfolded state of a lithium-ion battery cell according to the present disclosure, where FIG. 1A shows a positive plate, and FIG. 1B shows a negative plate;
  • FIG. 2A and FIG. 2B are schematic diagrams respectively showing a positive plate in a unfolded state and a negative plate in a unfolded state of another lithium-ion battery cell according to the present disclosure, where FIG. 2A shows a positive plate, and FIG. 2B shows a negative plate;
  • FIG. 3 is a schematic diagram showing a lithium-ion battery cell according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram showing a lithium-ion battery cell according to another embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram showing coating and positions of lugs of a lithium-ion battery cell according to the present disclosure
  • FIG. 6 is a diagram showing plate coating and lug distribution of a lithium-ion battery cell according to the present disclosure
  • FIG. 7 is a diagram showing arrangement of a plate with an interval of 0.5 cm between two positive lugs of a lithium-ion battery cell according to the present disclosure
  • FIG. 8 is a diagram showing arrangement of a negative plate with three lugs of a lithium-ion battery cell according to the present disclosure.
  • FIG. 9 is a diagram showing arrangement positions of lugs with an laminated structure and a staggered structure of the lithium-ion battery cell according to the present disclosure.
  • a lithium-ion battery cell is provided according to the present disclosure.
  • Multiple positive lugs are arranged sequentially on a positive plate in an unfolded state.
  • Multiple negative lugs are arranged sequentially on a negative plate in an unfolded state.
  • the positive plate and the negative plate are separated by a membrane and are wound to form the lithium-ion battery cell through a winding manner.
  • the multiple positive lugs may form a lug laminated structure or a lug staggered structure.
  • the multiple negative lugs may form a lug laminated structure or a lug staggered structure.
  • the multiple positive lugs and the multiple negative lugs may be located at one end of the lithium-ion battery cell, and may also be respectively located at two ends of the lithium-ion battery cell.
  • the lithium-ion battery cell according to the present disclosure is provided with at least one positive lug and at least one negative lug, such that the battery has a good large-current discharge performance, the density of the lugs may be determined according to actual needs.
  • a multiple-lugs wound design is adopted rather than a laminated design, thereby greatly reducing occurrence of burrs at the edge of the plate and reducing the self-discharge rate, thus improving the stability of the battery.
  • the multiple positive lugs are arranged in parallel in a direction along a length of the positive plate 6 .
  • a first lug margin x 1 indicates a distance between a first positive lug 2 and a head of the positive plate 6 .
  • the head of the positive plate 6 indicates the left end of the positive plate 6
  • the first positive lug 2 is located closet to the head of the positive plate 6 .
  • the lugs are not arranged at the leftmost or rightmost of the cell, and lug margins are provided to facilitate package of the cell and prevent occurrence of short circuits.
  • the lug margin indicates a distance from the lug to the edge of the cell.
  • t indicates a sum of thicknesses of the positive plate, the membrane and the negative plate, that is, a minimum thickness of the winding.
  • w indicates a width of the cell, that is, a width of the innermost layer of the cell.
  • n 1 indicates that a positive lug is located at the n 1 -th w on the positive plate along a direction from the head to a tail of the positive plate 6 , where n 1 ⁇ 2.
  • n 1 4
  • Values of other parameters are substituted into the equation, to calculate d 1 of the positive lug 4 , and d 1 of each of other positive lugs may be calculated by analogy.
  • the multiple negative lugs are arranged in parallel in a direction along a length of the negative plate 5 .
  • a second lug margin x 2 indicates a distance between a first negative lug 1 and the head of the negative plate 5 .
  • n 2 indicates that a negative lug is located at the n 2 -th w on the negative plate 5 along a direction from a head to a tail of the negative plate 5 , where n 2 ⁇ 2.
  • n 2 4
  • Values of other parameters are substituted into the equation, to calculate d 2 of the negative lug 3 , and d 2 of each of other negative lugs may be calculated by analogy.
  • the multiple positive lugs are arranged in parallel in a direction along the length of the positive plate 6
  • the first lug margin x 1 indicates the distance between the first positive lug 2 and the head of the positive plate 6 .
  • n 3 indicates that a positive lug is located at the (n 3 +1)-th w on the positive plate 6 along the direction from the head to the tail of the positive plate 6 .
  • n 3 4
  • Values of other parameters are substituted into the equation, to calculate d 1 of the positive lug 4 , and d 1 of each of other positive lugs may be calculated by analogy.
  • the multiple negative lugs are arranged in parallel in a direction along a length of the negative plate 5 .
  • a second lug margin x 2 indicates a distance between the first negative lug 1 and the head of the negative plate 5 .
  • n 4 indicates that a negative lug is located at the (n 4 +1)-th w on the negative plate 5 along the direction from the head to the tail of the negative plate 5 .
  • n 4 is 4
  • Values of other specific parameters are substituted into the equation, to calculate d 2 of the negative lug 3 , and d 2 of each of other negative lugs may be calculated by analogy.
  • the lithium-ion battery cell is square, and a membrane is arranged between the positive plate 6 and the negative plate 5 , two or more layers of the membranes may be arranged.
  • the multiple positive lugs may form a lug laminated structure and the multiple negative lugs may form a lug laminated structure.
  • the positive lugs are neatly laminated at one end of the cell 7
  • the negative lugs are neatly laminated at the same end of the cell 7 as the positive lugs, where x indicates the lug margin.
  • the first lug margin x 1 and the second lug margin x 2 may be the same or different.
  • the first lug margin x 1 is less than or equal to 0.5w
  • the second lug margin x 2 is less than or equal to 0.5w.
  • w indicates a width of the cell, and the width w of the cell is greater than or equal to 5 cm and less than or equal to 20 cm.
  • h indicates a height, a range of h is 5 cm ⁇ h ⁇ 20 cm.
  • a cell thickness is indicated by d, and a range of d is 0.5 cm ⁇ d ⁇ 5 cm.
  • a length L1 of the negative plate and a length L2 of the positive plate meet 10w ⁇ L1,L2 ⁇ 200w.
  • y indicates a length of the tail, where 0 ⁇ y ⁇ 8w.
  • the lithium-ion battery cell in the above embodiment adopts a winding manner.
  • positions of the second lug and subsequent lugs may be calculated through the equation nw ⁇ x+(0.5 ⁇ t ⁇ n ⁇ 0.5 ⁇ t) or nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t].
  • x is replaced by x 1 or x 2
  • n is replaced by n 1 , n 2 , n 3 or n 4 .
  • a position of a lug calculated through nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t is behind the n-th w
  • a position of a lug calculated through nw ⁇ x+(0.5 ⁇ t ⁇ n ⁇ 0.5 ⁇ t) is in front of the (n+1)-th w.
  • a current collector of the positive plate is aluminum foil
  • a current collector of the negative plate is copper foil.
  • the aluminum foil is continuously and uniformly coated with positive electrode slurry containing a lithium-ion active material to form the positive plate
  • the copper foil is continuously and uniformly coated with negative electrode slurry containing a lithium-ion active material to form the negative plate.
  • Uncoated regions are reserved on the coated sides of the positive and negative plates for arranging the positive and negative lugs respectively. After the winding, two or more lugs are welded together by using ultrasonic, or the lugs are directly welded to a transition metal plate, and the transition metal plate is welded to a top cover of the battery case subsequently.
  • the cell is formed with a winding manner by welding multiple lugs, such that the rate performance of a large and medium-sized lithium-ion battery is improved, and good consistency and stability of the battery can be obtained, thereby facilitating grouping and modularized expansion, thus ensuring a stable operation of the system and prolonging a service life of the system.
  • the lugs are moved forward or backward by a certain distance to form a lug staggered structure.
  • d 1 of each of the m 1 positive lugs in the multiple positive lugs is increased or decreased by a first interval value corresponding the positive lug, such that the multiple positive lugs form a lug staggered structure. That is, there are m 1 positive lugs being staggered in the multiple laminated positive lugs, where m 1 may be 1, 2, 3 and the like. Intervals between adjacent staggered positive lugs may be the same or different.
  • the multiple negative lugs may form a lug staggered structure.
  • d 2 of each of the m 2 negative lugs in the multiple negative lugs is increased or decreased by a second interval value corresponding the negative lug, such that there are m 2 negative lugs being staggered in the multiple laminated negative lugs, where m 2 may be 1, 2, 3 and the like.
  • Intervals between adjacent staggered negative lugs may be the same or different.
  • the arrangement 1 ′ of the negative electrode and the arrangement 2 ′ of the positive electrode in FIG. 4 are in a staggered manner.
  • the intervals between adjacent staggered positive lugs in the m 1 positive lugs are the same.
  • d 1 of each of the m 1 positive lugs is decreased by a first interval value mq.
  • d 1 n 1 w ⁇ x 1 +(0.5 ⁇ t ⁇ n 1 ⁇ 0.5 ⁇ t)
  • q indicates an interval between two adjacent staggered positive lugs
  • m indicates a sequence number of a positive lug in the m 1 positive lugs along a direction from the head to the tail of the positive plate, where 1 ⁇ m ⁇ m 1 .
  • d 1 of each of the m 1 positive lugs is increased by a first interval value mq.
  • d 1 n 3 w ⁇ x 1 +[0.5 ⁇ t ⁇ (n 3 +1) ⁇ 0.5 ⁇ t]
  • q indicates an interval between two adjacent staggered positive lugs
  • m indicates a sequence number of a positive lug in the m 1 positive lugs along a direction from the head to the tail of the positive plate, where 1 ⁇ m ⁇ m 1 .
  • the intervals between adjacent staggered negative lugs in the m 2 negative lugs are the same.
  • d 2 of each of the m 2 negative lugs is decreased by a first interval value mq.
  • d 2 n 2 w ⁇ x 2 +(0.5 ⁇ t ⁇ n 2 ⁇ 0.5 ⁇ t)
  • q indicates an interval between two adjacent staggered negative lugs
  • m indicates a sequence number of a negative lug in the m 2 negative lugs along a direction from the head to the tail of the negative plate, where 1 ⁇ m ⁇ m 2 .
  • d 2 of each of the m 2 negative lugs is increased by a first interval value mq.
  • d 2 n 4 w+x 2 +[0.5 ⁇ t ⁇ (n 4 +1) ⁇ 0.5 ⁇ t]
  • q indicates an interval between two adjacent staggered negative lugs
  • m indicates a sequence number of a negative lug in the m 2 negative lugs along a direction from the head to the tail of the negative plate, where 1 ⁇ m ⁇ m 2 .
  • the lugs are staggered and an interval between two adjacent lugs is indicated by q. If the first lug is in the middle, a lug on the left is moved outward by q, and a lug on the right is moved inward by q. For the lugs whose positions are calculated through nw ⁇ x+(0.5 ⁇ t ⁇ n ⁇ 0.5 ⁇ t), since the lugs are located behind the nw, it is required to moved forward the lugs starting from the second lug. For the lugs whose positions are calculated through nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t], since the lugs are located in front of the (n+1)w, it is required to move backward the lugs starting from the second lug.
  • a lithium-ion battery is further provided according to the present disclosure, which includes a battery case and the lithium-ion battery cell as described above located in the battery case.
  • the negative lugs and the positive lugs are located on the same side of the battery cell, the positive and negative lugs may be connected to an electrode pillar of the battery case by a bolt or through a riveting process.
  • the battery case is made of aluminum.
  • the positive plate is coated with positive electrode slurry, the positive electrode slurry is made by mixing a positive electrode powder, a conductive agent, an adhesive and an additive.
  • the negative plate is coated with negative electrode slurry, the negative electrode slurry is made by mixing a negative electrode powder, a conductive agent, an adhesive and an additive.
  • the performance of the slurry is improved to avoid the occurrence of lithium precipitation.
  • both thicknesses of a side wall and a front wall of the aluminum case are 0.3 mm.
  • a thickness of a bottom is 0.6 mm.
  • a thickness d of the cell is designed to be 0.82 cm.
  • a width of the positive plate is 14 cm.
  • a width of the negative plate is 14.2 cm.
  • a width of the membrane is 14.5 cm.
  • the positive active material is a ternary material and has a specific capacity of 150 mAh/g.
  • the negative active material is artificial graphite or composite graphite, and has a specific capacity of 345 mAh/g, and a capacity of the negative electrode is excessive by 4%.
  • the composition of the positive electrode slurry is: 95.5% of the ternary material, 2% of the adhesive, 1.5% of the conductive agent and 1% of a nano inorganic functional additive.
  • the compacted density is 3.6 g/cm 3 , a thickness of a single-layer coating is 0.064 mm, the surface density is 461 g/m 2 , a thickness of the current collector aluminum foil is 0.012 mm, and the calculated unit capacity is 7.224 mAh/cm 2 .
  • the composition of the negative electrode slurry is: 95.5% of the ternary material, 1.2% of a thickener, 1.5% of the adhesive, 1% of the conductive agent and 0.8% of a nano inorganic functional additive.
  • the compacted density is 1.5 g/cm 3
  • a thickness of a single-layer coating is 0.070 mm
  • a surface density is 224 g/m 2
  • a thickness of the current collector aluminum foil is 0.009 mm
  • the calculated unit capacity is 7.4 mAh/cm 2 .
  • t is 0.33 mm.
  • a length of a plate with a coating is 175 cm, specific coating sizes are shown in the following table 1 , and the capacity of the battery is 35 Ah.
  • the schematic diagram of coating is as shown in FIG. 5 , where x is set to 1.5 cm, a width of the lug is 1.5 cm, and w is calculated as 7 cm (a width of the innermost unit roll layer after the winding pin is pulled out).
  • the positive and negative plates are respectively provided with six lugs. Positions of the lugs may be calculated through the following equation nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t]. The calculated positions of the lugs are as shown in FIG. 5 (the interval between the positive lugs is the same as the interval between the negative lugs).
  • the lugs may be directly welded to the aluminum cover, or may be first welded to a large transition metal plate, and the transition metal plate is welded to the aluminum cover.
  • a highly wet negative active material such as a lightly oxidized graphite material may be used.
  • a silicon carbon negative electrode material may be used, which has a certain absorption effect on increase of the capacity.
  • the positions of the positive lugs are the same as the positions of the positive lugs in FIG. 5 , and the positions of the negative lugs are set according to the following equation nw ⁇ x+(0.5 ⁇ t ⁇ n ⁇ 0.5 ⁇ t), which are as shown in FIG. 6 .
  • the lugs of the lithium-ion battery cell are staggered, each of the positive plate and negative plate is provided with two lugs, where an interval between the lugs is 0.5 cm.
  • a staggered arrangement is formed by moving one of the lugs forward by 0.5 cm, where intervals between the staggered lugs are the same.
  • a staggered arrangement is formed by moving one of the lugs backward by 0.5 cm.
  • nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t] For a case where the lugs are distributed based on the following equation nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t], a staggered arrangement is formed by moving one of the lugs backward by 0.5 cm.
  • the lugs of the lithium-ion battery cell are staggered.
  • Each of the positive plate and negative plate is provided with three lugs, where each lug has a width of 1 cm, and intervals of the staggered lugs are 0.4 cm.
  • the positions of the negative lugs are as shown in FIG. 8 .
  • the positions of the positive lugs are similar to that of the negative lugs.
  • the lugs of the lithium-ion battery cell have a lug laminated structure or a lug staggered structure. Two groups of lugs are laminated, and intervals between the staggered lugs are 0.5 cm. The laminated lugs are located at positions calculated through the following equation nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t], and the staggered lugs are located at positions calculated through the following equation nw+x+[0.5 ⁇ t ⁇ (n+1) ⁇ 0.5 ⁇ t]+0.5. As shown in FIG.
  • n for the laminated lugs are 4 and 8 (corresponding to positions of 30.2 cm and 59.8 cm), and n for another group of the laminated lugs are 16 and 20 (corresponding to positions of 121.9 cm and 153.9 cm).
  • the laminated lugs are located at positions calculated through the following equation nw ⁇ x+(0.5 ⁇ t ⁇ n ⁇ 0.5 ⁇ t)
  • the staggered lugs are located at positions calculated through the following equation nw ⁇ x+(0.5 ⁇ t ⁇ n ⁇ 0.5 ⁇ t) ⁇ 0.5.
  • the lithium-ion battery cell and the lithium-ion battery adopt a multi-lug design, which greatly improves the rate performance of the battery.
  • the multi-lug design based on the winding manner, the consistency of the cell is improved, thereby facilitating grouping and modularized expansion, thus ensuring the stable operation of the system and prolonging the service life of the system.
  • a simple method of improving the composition of the slurry is adopted, thereby avoiding the occurrence of lithium precipitation at the negative electrode, thus improving the production efficiency while improving the safety performance.
  • the winding multi-lug design is adopted instead of the laminated design, thereby greatly reducing the occurrence of burrs at the edge of the plate and reducing the self-discharging rate, thus improving the stability of the battery.
  • the method and the system of the present disclosure may be implemented in many ways.
  • the method and the system of the present disclosure may be implemented by software, hardware, firmware or any combination of the software, the hardware and the firmware.
  • the above sequence of steps used in the method is only for illustration, and the steps of the method of the present disclosure are not limited to the above-described specific order unless otherwise specified.
  • the present disclosure may also be implemented as programs recorded in a recording medium, the programs include machine-readable instructions for implementing the method according to the present disclosure.
  • the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Separators (AREA)
US15/779,384 2015-11-30 2016-10-25 Lithium-ion battery cell and lithium-ion battery Abandoned US20180342759A1 (en)

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PCT/CN2016/103256 WO2017092520A1 (zh) 2015-11-30 2016-10-25 一种锂离子电池电芯及锂离子电池

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EP3386025B1 (en) 2021-07-21
EP3386025A1 (en) 2018-10-10
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CA3004955C (en) 2020-12-29
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